Patents by Inventor David M. Kerxhalli
David M. Kerxhalli has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 7787810Abstract: A color registration method, system, and computer program product generally includes a plurality of imaging stations and one or more MOB (Marks-On Belt) sensors. An indication is initially provided to each imaging station among the imaging stations, which colors among a plurality of colors associated with said color registration system are active. Next, an arbitrary imaging station among the imaging stations can be assigned as a reference color. Thereafter, the arbitrary imaging station can be instructed to write an appropriate color pattern to replace marks associated with any imaging among imaging stations not enabled with the marks with respect to said reference color in order to thereby produce a resulting color ensemble that is detectable by one or more MOB sensors.Type: GrantFiled: July 27, 2007Date of Patent: August 31, 2010Assignee: Xerox CorporationInventors: David M. Kerxhalli, Thomas M. Baretsky
-
Publication number: 20090028614Abstract: A color registration method, system, and computer program product generally includes a plurality of imaging stations and one or more MOB (Marks-On Belt) sensors. An indication is initially provided to each imaging station among the imaging stations, which colors among a plurality of colors associated with said color registration system are active. Next, an arbitrary imaging station among the imaging stations can be assigned as a reference color. Thereafter, the arbitrary imaging station can be instructed to write an appropriate color pattern to replace marks associated with any imaging among imaging stations not enabled with the marks with respect to said reference color in order to thereby produce a resulting color ensemble that is detectable by one or more MOB sensors.Type: ApplicationFiled: July 27, 2007Publication date: January 29, 2009Inventors: David M. Kerxhalli, Thomas M. Baretsky
-
Patent number: 7298998Abstract: A system and method to control imaging devices in a single-pass multi-color electrophotographic printing machine that includes a photoconductive member having a timing aperture, the photoconductive member moving along a path in the printing machine, and a plurality of imaging devices, each one of the plurality of imaging devices writing a latent image on the photoconductive member. The system further includes a sensor, located adjacent the photoconductive member, to sense the aperture in the photoconductive member as it passes the sensor and generate a signal indicative thereof and a control device and method that provides a timing signal for each of the plurality of imaging devices based on the signal generated by the sensor and a clock signal that is synchronous for all of the imaging devices.Type: GrantFiled: June 26, 2006Date of Patent: November 20, 2007Assignee: Xerox CorporationInventors: Ana P. Tooker, David M. Kerxhalli, Thomas M. Baretsky
-
Patent number: 7071956Abstract: A method of correcting output image squareness in a laser printer system having a Raster Output Scanning (ROS) device with a pivotal mounting. The method includes printing a test pattern that includes a plurality of markers printed in a predetermined geometric arrangement and calculating a skew angle based on the measured distances, preferably using the Law of Cosines. The ROS device is then automatically rotated by an amount sufficient to correct the skew angle. The ROS rotation is performed automatically by an adjustment system connected to the ROS. The method optionally includes a scanner for scanning the test pattern image and making the measurements automatically via a program configured to analyze the scanned image.Type: GrantFiled: January 7, 2002Date of Patent: July 4, 2006Assignee: Xerox CorporationInventors: Brian R. Conrow, David M. Kerxhalli
-
Patent number: 7039348Abstract: A method for repositioning a mark on a belt after an image on paper registration process, which includes printing a test pattern, measuring at least one test pattern parameter, detecting a mark on a belt and detecting at least one imaging error associated therewith, using the at least one test pattern parameter and the at least one imaging error to determine the lateral distance required to shift a particular image to a desired location on the belt and shifting the image to the desired location.Type: GrantFiled: July 30, 2003Date of Patent: May 2, 2006Assignee: Xerox CorporationInventors: David M. Kerxhalli, Keith A. May, Brian R. Conrow, Michael J. Martin, Michael J. Thomas
-
Patent number: 6903758Abstract: A method for preserving image squareness and image on image registration in a system having a plurality of imaging stations, each imaging station having an ROS. The method includes adjusting the target skew of a reference ROS within one of the plurality of imaging stations by the angular difference between the actual reference ROS position and the target position for the reference ROS and adjusting the target skew of the reference ROS by the skew of the reference ROS relative to the desired skew for image squareness.Type: GrantFiled: July 30, 2003Date of Patent: June 7, 2005Assignee: Xerox CorporationInventors: David M. Kerxhalli, Keith A. May, Brian R. Conrow
-
Patent number: 6806896Abstract: The relationship between first and second side images is evaluated to determine how the position of the paper and/or the size and arrangement of an image can be manipulated to compensate for paper shrinkage caused by fusing. Show through is reduced by performing setup to adjust a pixel clock frequency and/or a photoreceptor speed, determining a residual magnification error, determining margin shifts to compensate for the residual magnification error, and applying the margin shifts. Paper shrink effects on registration can be compensated for using determinations made during a typical printer setup. Show through errors can be reduced without using a paper conditioner to pre-shrink or re-wet the paper. In simplex and duplex printing, the show through errors worsen as the image moves away from the registration edge. Using information obtained during setup, a margin shift is determined that results in a significant reduction in the maximum show through for each image.Type: GrantFiled: August 22, 2003Date of Patent: October 19, 2004Assignee: Xerox CorporationInventors: Brian R. Conrow, David M. Kerxhalli
-
Patent number: 6763199Abstract: Initial setup of image to sheet (IOS) or image to paper (IOP) registration in a printing device such as, for example, an electrographic printer, is accomplished in a single step that uses an initial set of measurements to determine and correct each of the independent registration errors, including image squareness/ROS skew, image skew/paper skew, lateral magnification, process magnification, lateral direction IOS or IOP position, and process direction IOS or IOP position simultaneously. A set of algorithms is used to perform a series of geometrical transformations to determine each of the six errors affecting IOS or IOP registration.Type: GrantFiled: January 16, 2002Date of Patent: July 13, 2004Assignee: Xerox CorporationInventors: Brian R. Conrow, David M. Kerxhalli
-
Publication number: 20040114025Abstract: A method for repositioning a mark on a belt after an image on paper registration process, which includes printing a test pattern, measuring at least one test pattern parameter, detecting a mark on a belt and detecting at least one imaging error associated therewith, using the at least one test pattern parameter and the at least one imaging error to determine the lateral distance required to shift a particular image to a desired location on the belt and shifting the image to the desired location.Type: ApplicationFiled: July 30, 2003Publication date: June 17, 2004Applicant: Xerox CorporationInventors: David M. Kerxhalli, Keith A. May, Brian R. Conrow, Michael J. Martin, Michael J. Thomas
-
Publication number: 20040036847Abstract: The relationship between first and second side images is evaluated to determine how the position of the paper and/or the size and arrangement of an image can be manipulated to compensate for paper shrinkage caused by fusing. Show through is reduced by performing setup to adjust a pixel clock frequency and/or a photoreceptor speed, determining a residual magnification error, determining margin shifts to compensate for the residual magnification error, and applying the margin shifts. Paper shrink effects on registration can be compensated for using determinations made during a typical printer setup. Show through errors can be reduced without using a paper conditioner to pre-shrink or re-wet the paper. In simplex and duplex printing, the show through errors worsen as the image moves away from the registration edge. Using information obtained during setup, a margin shift is determined that results in a significant reduction in the maximum show through for each image.Type: ApplicationFiled: August 22, 2003Publication date: February 26, 2004Applicant: Xerox CorporationInventors: Brian R. Conrow, David M. Kerxhalli
-
Patent number: 6667756Abstract: The relationship between first and second side images is evaluated to determine how the position of the paper and/or the size and arrangement of an image can be manipulated to compensate for paper shrinkage caused by fusing. Show through is reduced by performing setup to adjust a pixel clock frequency and/or a photoreceptor speed, determining a residual magnification error, determining margin shifts to compensate for the residual magnification error, and applying the margin shifts. Paper shrink effects on registration can be compensated for using determinations made during a typical printer setup. Show through errors can be reduced without using a paper conditioner to pre-shrink or re-wet the paper. In simplex and duplex printing, the show through errors worsen as the image moves away from the registration edge. Using information obtained during setup, a margin shift is determined that results in a significant reduction in the maximum show through for each image.Type: GrantFiled: August 27, 2001Date of Patent: December 23, 2003Assignee: Xerox CorporationInventors: Brian R. Conrow, David M. Kerxhalli
-
Publication number: 20030133000Abstract: Initial setup of image to sheet (IOS) or image to paper (IOP) registration in a printing device such as, for example, an electrographic printer, is accomplished in a single step that uses an initial set of measurements to determine and correct each of the independent registration errors, including image squareness/ROS skew, image skew/paper skew, lateral magnification, process magnification, lateral direction IOS or IOP position, and process direction IOS or IOP position simultaneously. A set of algorithms is used to perform a series of geometrical transformations to determine each of the six errors affecting IOS or IOP registration.Type: ApplicationFiled: January 16, 2002Publication date: July 17, 2003Applicant: XEROX CORPORATIONInventors: Brian R. Conrow, David M. Kerxhalli
-
Publication number: 20030128401Abstract: A method of correcting output image squareness in a laser printer system having a Raster Output Scanning (ROS) device with a pivotal mounting. The method includes printing a test pattern that includes a plurality of markers printed in a predetermined geometric arrangement and calculating a skew angle based on the measured distances, preferably using the Law of Cosines. The ROS device is then automatically rotated by an amount sufficient to correct the skew angle. The ROS rotation is performed automatically by an adjustment system connected to the ROS. The method optionally includes a scanner for scanning the test pattern image and making the measurements automatically via a program configured to analyze the scanned image.Type: ApplicationFiled: January 7, 2002Publication date: July 10, 2003Applicant: XEROX CORPORATIONInventors: Brian R. Conrow, David M. Kerxhalli
-
Publication number: 20030043256Abstract: The relationship between first and second side images is evaluated to determine how the position of the paper and/or the size and arrangement of an image can be manipulated to compensate for paper shrinkage caused by fusing. Show through is reduced by performing setup to adjust a pixel clock frequency and/or a photoreceptor speed, determining a residual magnification error, determining margin shifts to compensate for the residual magnification error, and applying the margin shifts. Paper shrink effects on registration can be compensated for using determinations made during a typical printer setup. Show through errors can be reduced without using a paper conditioner to pre-shrink or re-wet the paper. In simplex and duplex printing, the show through errors worsen as the image moves away from the registration edge. Using information obtained during setup, a margin shift is determined that results in a significant reduction in the maximum show through for each image.Type: ApplicationFiled: August 27, 2001Publication date: March 6, 2003Inventors: Brian R. Conrow, David M. Kerxhalli
-
Patent number: 6300968Abstract: In color printing with a color registration system for the registration of plural color images on an image bearing surface, such as a photoreceptor belt of a color printer, registration marks are imaged on the image bearing surface, which registration marks correspond to the color images and are sensed by a registration marks sensor. In an initial gross registration mode the system first automatically images first registration marks, in the form of expanded chevron targets, which are greatly expanded in the process direction so as to avoid overlapping marks even if there is initial gross misregistration, to thus provide wider initial misregistration latitude for the sensor. When an acceptable initial registration is achieved, the system automatically switches to imaging more closely spaced and more frequent second registration marks, preferably regular chevron targets, providing higher registration accuracy.Type: GrantFiled: November 2, 2000Date of Patent: October 9, 2001Assignee: Xerox CorporationInventors: David M. Kerxhalli, Olga Y. Ramirez, Brian R. Conrow, Ronald E. Shaul, Stanley J. Wallace, Mark A. Omelchenko